IcspMasterImpl.java

/*
 * Copyright 2011 Ytai Ben-Tsvi. All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARSHAN POURSOHI OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied.
 */
package ioio.lib.impl;

import java.io.IOException;
import java.util.LinkedList;
import java.util.Queue;

import ioio.lib.api.IcspMaster;
import ioio.lib.api.exception.ConnectionLostException;
import ioio.lib.impl.IncomingState.DataModuleListener;
import ioio.lib.impl.ResourceManager.Resource;

class IcspMasterImpl extends AbstractResource implements IcspMaster,
        DataModuleListener {
    private Queue<Integer> resultQueue_ = new LinkedList<Integer>();
    private int rxRemaining_ = 0;
    private final Resource icsp_;
    private final Resource[] pins_;

    public IcspMasterImpl(IOIOImpl ioio, Resource icsp, Resource[] pins)
            throws ConnectionLostException {
        super(ioio);
        icsp_ = icsp;
        pins_ = pins;
    }

    @Override
    synchronized public void dataReceived(byte[] data, int size) {
        assert (size == 2);
        int result = (byteToInt(data[1]) << 8) | byteToInt(data[0]);
        resultQueue_.add(result);
        notifyAll();
    }

    @Override
    synchronized public void reportAdditionalBuffer(int bytesToAdd) {
        rxRemaining_ += bytesToAdd;
        notifyAll();
    }

    @Override
    synchronized public void enterProgramming() throws ConnectionLostException {
        checkState();
        try {
            ioio_.protocol_.icspEnter();
        } catch (IOException e) {
            throw new ConnectionLostException(e);
        }
    }

    @Override
    synchronized public void exitProgramming() throws ConnectionLostException {
        checkState();
        try {
            ioio_.protocol_.icspExit();
        } catch (IOException e) {
            throw new ConnectionLostException(e);
        }
    }

    @Override
    synchronized public void executeInstruction(int instruction)
            throws ConnectionLostException {
        checkState();
        try {
            ioio_.protocol_.icspSix(instruction);
        } catch (IOException e) {
            throw new ConnectionLostException(e);
        }
    }

    @Override
    synchronized public void readVisi() throws ConnectionLostException,
            InterruptedException {
        checkState();
        while (rxRemaining_ < 2) {
            safeWait();
        }
        rxRemaining_ -= 2;
        try {
            ioio_.protocol_.icspRegout();
        } catch (IOException e) {
            throw new ConnectionLostException(e);
        }
    }

    @Override
    synchronized public void close() {
        checkClose();
        try {
            ioio_.protocol_.icspClose();
        } catch (IOException e) {
        }
        for (Resource pin : pins_) {
            ioio_.closePin(pin);
        }
        ioio_.resourceManager_.free(icsp_);
        super.close();
    }

    private static int byteToInt(byte b) {
        return ((int) b) & 0xFF;
    }

    @Override
    public synchronized int waitVisiResult() throws ConnectionLostException,
            InterruptedException {
        checkState();
        while (resultQueue_.isEmpty()) {
            safeWait();
        }
        return resultQueue_.remove();
    }
}